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Lattice Hamiltonian approach to the massless Schwinger model: precise extraction of the mass gap

Research output: Contribution to journalJournal article

Published

Journal publication date07/2013
JournalComputer Physics Communications
Journal number7
Volume184
Number of pages7
Pages1666-1672
Original languageEnglish

Abstract

We present results of applying the Hamiltonian approach to the massless Schwinger model. A finite basis is constructed using the strong coupling expansion to a very high order. Using exact diagonalization, the continuum limit can be reliably approached. This allows to reproduce the analytical results for the ground state energy, as well as the vector and scalar mass gaps to an outstanding precision better than 10^−6%.